Defects Produced by Spoilage Organisms in Cottage Cheese Sterilized by Cathode Rays

Five genera of bacteria, two of yeasts and three of molds, were isolated, identified and inoculated, individually and with Streptococcus lactis, into cottage cheese which had been sterilized by cathode rays at 5.5 x 10 ~ rep. Two species of Achromobacter, one Alcaligenes, two Escherichia, four Pseudomonas, one Rhodotorula, and one Torulopsis all produced slime on cottage cheese. The characteristics of the slime varied with the species. Species of Achromobacter and Escherichia produced defects quicker when inoculated alone, but species of yeasts and three Pseudomonas cultures produced defects quicker with S. lactis. The molds produced pigmented growth characteristic of each genus. Editor.